simple libc tests

based on the libc-testsuit and libc-bench of dalias

see http://git.etalabs.net/cgi-bin/gitweb.cgi

build tests:

	cp dist/config.mak .

	# edit config.mak

	make

run tests:

	make t

run benchmarks:

	make b

framework:

the only hook in the test framework is error(...) which

prints a formatted message and sets the test to failed

see common/test.h

a test function looks like

	void test_foo() {

		if (foo != 42)

			error("foo=%d expected 42\n", foo);

	}

extern functions with name ~ /^test/ are recognized to be

test functions

a benchmark function looks like

	void bench_foo(int N) {

		for (i = 0; i < N; i++)

			foo();

	}

benchmark functions are repeatedly called with an increasing

N until the running time is long enough, then time/N is printed

see Makefile.inc for build system details

see common/t.c for test details

see common/b.c for benchmark details